CN115646444B - Sewage dephosphorization material and preparation method thereof - Google Patents
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- CN115646444B CN115646444B CN202211323676.5A CN202211323676A CN115646444B CN 115646444 B CN115646444 B CN 115646444B CN 202211323676 A CN202211323676 A CN 202211323676A CN 115646444 B CN115646444 B CN 115646444B
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- 239000000463 material Substances 0.000 title claims abstract description 75
- 239000010865 sewage Substances 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- 239000010440 gypsum Substances 0.000 claims abstract description 43
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 43
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000010936 titanium Substances 0.000 claims abstract description 38
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 38
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 31
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 31
- 239000011574 phosphorus Substances 0.000 claims abstract description 31
- 239000010802 sludge Substances 0.000 claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000010881 fly ash Substances 0.000 claims abstract description 21
- 229910021538 borax Inorganic materials 0.000 claims abstract description 15
- 238000005245 sintering Methods 0.000 claims abstract description 15
- 239000004328 sodium tetraborate Substances 0.000 claims abstract description 15
- 235000010339 sodium tetraborate Nutrition 0.000 claims abstract description 15
- 238000001179 sorption measurement Methods 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 30
- 239000002994 raw material Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 23
- 239000002245 particle Substances 0.000 claims description 19
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 17
- 239000000203 mixture Substances 0.000 claims description 9
- 238000007605 air drying Methods 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 2
- 239000008188 pellet Substances 0.000 claims 1
- 239000002910 solid waste Substances 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 8
- 239000000945 filler Substances 0.000 abstract description 5
- 238000001035 drying Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 11
- 239000000126 substance Substances 0.000 description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002306 biochemical method Methods 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- -1 iron ions Chemical class 0.000 description 2
- 238000009740 moulding (composite fabrication) Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000010902 straw Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000004683 dihydrates Chemical group 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000020774 essential nutrients Nutrition 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 150000002506 iron compounds Chemical class 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 235000015112 vegetable and seed oil Nutrition 0.000 description 1
- 239000008158 vegetable oil Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
Abstract
The invention discloses a sewage dephosphorization material and a preparation method thereof, belonging to the technical field of water treatment. The invention provides a preparation method of a sewage dephosphorization material, which is used for improving the resource utilization rate of solid wastes such as titanium gypsum, fly ash, municipal sludge and the like and obtaining the sewage dephosphorization material with excellent effect, and comprises the following steps: mixing titanium gypsum, fly ash, municipal sludge and borax uniformly, then balling, drying and sintering to obtain the sewage dephosphorization material. The dephosphorization material obtained by the invention has excellent dephosphorization effect, can be used as an adsorption filter material or a sewage treatment filler for removing phosphorus in sewage, has simple preparation process and high comprehensive utilization rate of solid wastes, and has good environmental and economic benefits.
Description
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a sewage dephosphorization material and a preparation method thereof.
Background
Phosphorus is an essential nutrient substance for forming organisms, has no toxicity, but the phosphorus-containing wastewater is directly discharged into water body if untreated, and can cause eutrophication of the water body and seriously pollute the water environment.
At present, common methods for treating the phosphorus-containing wastewater include a biochemical method, a chemical method, an adsorption method and the like. The chemical method has larger dosage, higher wastewater treatment cost and can produce a large amount of phosphorus-containing sludge. The biochemical method has strict requirements on water quality environment and is sensitive to water quality change. The adsorption method has the advantages of low energy consumption, simple operation and no secondary pollution, and is one of the common dephosphorization methods, but the adsorption dephosphorization performance is still to be improved.
The titanium gypsum is acidic industrial solid waste generated in the production process of titanium dioxide by a sulfuric acid method, and the main component is dihydrate gypsum (CaSO) 4 ·2H 2 O). The titanium gypsum discharge amount reaches 2600 tens of thousands of tons in 2020 and approximately 3000 tens of thousands of tons in 2021 in the third rank of industrial byproduct gypsum, but titanium gypsum does not attract enough attention to society relative to desulfurized gypsum. Titanium gypsum has low purity and contains a large amount of Fe 2 O 3 、TiO 2 、MgO、Al 2 O 3 、SiO 2 The impurities such as titanium gypsum are difficult to comprehensively utilize and recycle, and at present, the titanium gypsum is an industrial byproduct gypsum with the lowest utilization rate, and the comprehensive utilization rate is only about 35 percent. In large-scale utilization of building materials such as cement, the addition amount of titanium gypsum is low, generally not more than 10%, because of product performance control and the like. Fly ash is solid waste collected from coal combustion flue gas, and the main chemical component of the fly ash is SiO 2 、Al 2 O 3 、Fe 2 O 3 CaO, unburned carbon. Sludge is a precipitate substance produced in the sewage treatment process, has high water content and complex composition, and is easy to be decomposed and smelly. If the solid wastes are stacked randomly without rational treatment, a large amount of land resources are occupied, secondary pollution is caused to the environment, and huge economic burden is brought to enterprises, so that finding a reasonable large-scale resource utilization way is particularly important.
201811050641.2A biomass carbon-based desulfurized gypsum dephosphorization rod and a preparation and use method thereof are disclosed, 50-60 parts by mass of desulfurized gypsum, 35-45 parts by mass of crop straw or saw dust and 3-5 parts by mass of vegetable oil and water are uniformly mixed according to mass proportion, and a small amount of purified water is added to obtain a mixture; compressing the mixture into rod-shaped particles with the diameter of 0.5-2 cm and the length of 3-5 cm, then placing the rod-shaped particles into a vacuum atmosphere furnace for anaerobic calcination treatment at the temperature of 500-700 ℃ for 1-2 hours, and cooling to obtain the biomass carbon-based desulfurized gypsum dephosphorization rod. The method requires vacuum calcination and has complex preparation process.
201911417473.0A dephosphorization ceramsite and a preparation method thereof are disclosed, wherein dry bottom mud, fly ash, dry plant straw powder and iron powder are mixed according to the mass ratio (7-17): (1-2): (1-2): 1, uniformly mixing, adding water, uniformly stirring, forming and drying to obtain raw material balls; the raw material balls are put into a sintering furnace, heated to 320-380 ℃ at the speed of 5-10 ℃/min, pre-sintered at the temperature of 5-8 ℃/min, heated to 1000-1100 ℃ at the temperature of 5-8 ℃/min, and sintered at the temperature of heat to obtain the dephosphorized ceramic particles. In order to improve the dephosphorization effect of the ceramsite, iron powder is required to be added in the granulating process, and then the ceramsite is required to be sintered at the temperature of more than 1000 ℃ to obtain the ceramsite, so that the ceramsite has high cost and is not energy-saving and environment-friendly enough.
Therefore, it is necessary to develop a sewage dephosphorization material with good dephosphorization effect, simple preparation process and low cost.
Disclosure of Invention
The invention aims to improve the recycling utilization rate of solid wastes such as titanium gypsum, fly ash, municipal sludge and the like, reduce the recycling utilization cost and reduce the environmental impact of the solid wastes, and the solid wastes are uniformly mixed with borax to prepare the sewage dephosphorization material, so that the material has high adsorption and removal rate of phosphorus and excellent dephosphorization effect.
In order to achieve the aim of the invention, the invention provides a preparation method of a sewage dephosphorization material, which comprises the following steps:
A. uniformly mixing titanium gypsum, fly ash, municipal sludge and borax to obtain a mixture;
B. balling the mixture, and then naturally air-drying to obtain raw material balls;
C. sintering the raw material balls at high temperature, and then cooling to room temperature along with a furnace to obtain the sewage dephosphorization material;
wherein, the mass ratio of the titanium gypsum, the fly ash, the municipal sludge and the borax is 20-40: 30-50: 20-40: 5 to 10.
Wherein, in the preparation method of the sewage dephosphorization material, the titanium gypsum is directly used in a form of free water, and the water content is 15 to 30wt% of iron (according to Fe 2 O 3 Calculated by weight) is 13-18 percent of TiO 2 The content is 2-5 wt%.
In the preparation method of the sewage dephosphorization material, the municipal sludge is biochemical sludge of a municipal sewage plant, and the water content of the municipal sludge is 75-85 wt%.
In the preparation method of the sewage dephosphorization material, the natural air drying time is 1-2 d.
In the preparation method of the sewage dephosphorization material, the particle size of raw balls of the material is 4-7 mm.
In the preparation method of the sewage dephosphorization material, the particle size of the sewage dephosphorization material is 3-5 mm.
The preparation method of the sewage dephosphorization material is characterized by comprising the following steps: the sintering process is carried out by raising the temperature to 800-900 ℃ at the heating rate of 2-5 ℃/min for 1-2 h. .
By adopting the method, the invention prepares the sewage dephosphorization material.
The hydrochloric acid solubility of the sewage dephosphorization material is 0.63-1.79% by optimizing the raw material components and the proportion; the adsorption removal rate of phosphorus is 91.27-98.39%.
The invention has the beneficial effects that:
compared with the existing comprehensive utilization technology, the invention uses the solid waste titanium gypsum, the fly ash and the municipal sludge as raw materials to prepare the sewage dephosphorization material, and the adding amount of the titanium gypsum reaches 20-40 parts and is obviously more than that of the titanium gypsum in other utilization processes; the addition amount of the fly ash is 30-50 parts by mass, and the use amount is obviously reduced; the comprehensive utilization rate of the municipal sludge is also obviously improved; particularly, the invention fully utilizes a large amount of water contained in the titanium gypsum and the municipal sludge, so that additional water is not needed in the preparation process, and water resources are saved; the titanium gypsum and the municipal sludge do not need to be specially dried, so that the energy consumption is reduced; belongs to an environment-friendly manufacturing method.
The invention can save resources, change waste into valuable, and is beneficial to reducing production cost, thereby being an effective comprehensive utilization method of solid waste resources, the hydrochloric acid solubility of the obtained sewage dephosphorization material is as low as 0.63-1.79 percent, the adsorption removal rate of phosphorus is as high as 91.27-98.39 percent, and the invention is particularly suitable for sewage dephosphorization and has better popularization prospect.
Drawings
FIG. 1 is a diagram showing the microscopic morphology of the wastewater dephosphorization material prepared by the invention.
Detailed Description
In particular to a preparation method of a sewage dephosphorization material, which comprises the following steps:
A. uniformly mixing titanium gypsum, fly ash, municipal sludge and borax to obtain a mixture;
B. balling the mixture, and then naturally air-drying to obtain raw material balls;
C. sintering the raw material balls at high temperature, and then cooling to room temperature along with a furnace to obtain the sewage dephosphorization material;
the research shows that the fly ash is not added in the step A, and the prepared dephosphorization material has the adsorption and removal rate of phosphorus>90%, but due to SiO in the raw material component 2 And Al 2 O 3 The content of the catalyst is difficult to meet the reinforcing condition in the firing process of the dephosphorization material, and the hydrochloric acid solubility rate of the catalyst>7%, the hydrochloric acid solubility rate is higher, and the method is not suitable for sewage treatment filler. The titanium gypsum is not added, and the prepared dephosphorization material has hydrochloric acid solubility rate<2, the removal of phosphorus by the obtained material mainly depends on the surface adsorption effect of the material, and the adsorption removal rate of phosphorus<80 percent, and the phosphorus adsorption removal rate is lower. In the step A of the invention, the raw materials are titanium gypsum, fly ash, municipal sludge and borax, and the components are matched and controlled to be 20-40 in mass part ratio: 30-50: 20-40: 5 to 10, remarkably reduces the solubility of hydrochloric acid and further improves the dephosphorization capability, and is very suitable for dephosphorization of sewage. Wherein the water content of the municipal sludge is 75-85 wt%, the water content of the titanium gypsum is 15-30 wt%, the water content is favorable for raw material balling, and the ball has high strength and is not easy to crack.
The invention adds titanium gypsum into the raw materials, the main component of the titanium gypsum is CaSO 4 ·2H 2 O and titanium gypsum contains a large amount of iron compounds, and active calcium ions in the raw materials are removedThe ions and iron ions can react with phosphorus in the water body to generate phosphate precipitate, and the precipitate is adsorbed on the surface of the material to achieve the efficient removal of phosphorus, so that iron powder, calcium salt and the like are not required to be artificially added, and the preparation cost is reduced. In addition, titanium gypsum contains a certain amount of TiO 2 ，TiO 2 The method has the advantages that the method can also play a role in catalyzing the removal of phosphorus, and iron ions can promote the catalytic reaction, so that the phosphorus removal effect is improved.
The invention prepares the sewage dephosphorization material by taking solid waste titanium gypsum, fly ash and municipal sludge as raw materials, wherein the raw materials contain oxides of silicon, aluminum, iron, calcium, titanium and the like, and borax is added to react under high temperature to generate borosilicate double salt, so that the chemical stability of the material is enhanced, the strength of the material is improved, and the material is suitable for being used as an adsorption filter material or a sewage treatment filler for removing phosphorus in sewage, and has long service life.
In the step B, the material balls are directly sintered at high temperature without natural air drying, the moisture content in the material balls is high, and the moisture in the raw material balls is volatilized rapidly due to too strong temperature change in the sintering process, so that the material is easy to burst. Natural air drying is adopted for 1-2 d, and CaO and SiO in raw materials are dried in the air 2 、Al 2 O 3 、CaSO 4 The components are hydrated, so that the raw material balls are hardened, and the strength of the material is improved.
In the step C, the sintering process is carried out at the temperature rising rate of 2-5 ℃/min to 800-900 ℃, so that substances such as silicon, aluminum, iron, calcium, titanium, boron and the like in the raw materials are subjected to structural transformation to form a stable and high-strength structural system, the sintering time is controlled to be 1-2 hours, the condition that the time is too short, the mechanical strength of the material is low and the time is too long is avoided, a large amount of molten substances are generated in the material, the enamel on the surface is thickened, the specific surface area of the material is reduced, and the adsorption effect is affected.
The present invention will be described in further detail by way of examples, which are not intended to limit the scope of the invention.
Example 1
Uniformly mixing 22 parts by mass of titanium gypsum, 35 parts by mass of fly ash, 35 parts by mass of municipal sludge and 8 parts by mass of borax, preparing raw material balls with the particle size of 5mm, naturally airing for 1d, and then heating to 900 ℃ at the heating rate of 3 ℃/min for 1h to obtain the sewage dephosphorization material with the particle size of 3mm. The microscopic morphology of the material is shown in figure 1.
The hydrochloric acid solubility of the sewage dephosphorization material is 1.01%, and when the material is used for treating sewage containing phosphorus, the initial phosphorus concentration is 20mg/L, and the adding amount of the dephosphorization material is 80g/L, the phosphorus removal rate is 93.79%.
Example 2
Uniformly mixing 28 parts by mass of titanium gypsum, 45 parts by mass of fly ash, 20 parts by mass of municipal sludge and 7 parts by mass of borax, preparing raw material balls with the particle size of 5mm, naturally airing for 1d, and then heating to 850 ℃ at the heating rate of 3 ℃/min for sintering for 1h to obtain the sewage dephosphorization material with the particle size of 4mm.
The hydrochloric acid solubility of the sewage dephosphorization material is 0.74%, and when the material is used for treating sewage containing phosphorus, the initial phosphorus concentration is 20mg/L, and the adding amount of the dephosphorization material is 80g/L, the phosphorus removal rate is 92.36%.
Example 3
Uniformly mixing 36 parts by mass of titanium gypsum, 30 parts by mass of fly ash, 25 parts by mass of municipal sludge and 9 parts by mass of borax, preparing raw material balls with the particle size of 6mm, naturally airing for 1d, and then heating to 800 ℃ at the heating rate of 4 ℃/min for sintering for 1.5h to obtain the sewage dephosphorization material with the particle size of 5mm.
The hydrochloric acid solubility of the sewage dephosphorization material is 1.75%, and when the material is used for treating sewage containing phosphorus, the initial phosphorus concentration is 20mg/L, and the adding amount of the dephosphorization material is 80g/L, the phosphorus removal rate is 96.43%.
Comparative example 1
Mixing 46 parts by mass of titanium gypsum, 46 parts by mass of municipal sludge and 8 parts by mass of borax uniformly to prepare raw balls of a material with the particle size of 7mm, naturally airing for 1d, and then raising the temperature to 800 ℃ at the heating rate of 4 ℃/min to sinter for 1h, wherein the particle size of the obtained material is 5mm, the hydrochloric acid solubility rate is 7.19%, and the hydrochloric acid solubility rate is higher, so that the titanium gypsum is not suitable for being used as a sewage treatment filler for sewage dephosphorization.
Comparative example 2
The method comprises the steps of uniformly mixing 46 parts by mass of fly ash, 46 parts by mass of municipal sludge and 8 parts by mass of borax, preparing raw material balls with the particle size of 6mm, naturally airing for 1d, then raising the temperature to 800 ℃ at the heating rate of 4 ℃/min, sintering for 1h, wherein the particle size of the obtained material is 5mm, the hydrochloric acid solubility rate is 1.13%, the initial phosphorus concentration is 20mg/L, and the phosphorus removal rate is 76.54% when the phosphorus-containing sewage is treated by the material and the adding amount of a phosphorus removal material is 80 g/L.
Comparative example 3
Uniformly mixing 25 parts by mass of titanium gypsum, 17 parts by mass of fly ash, 50 parts by mass of municipal sludge and 8 parts by mass of borax, preparing raw balls of a material with the particle size of 6mm, naturally airing for 1d, and then heating to 900 ℃ at the heating rate of 3 ℃/min for sintering for 1h, wherein the particle size of the obtained material is 4mm, the hydrochloric acid solubility rate is 6.48%, and the hydrochloric acid solubility rate is high, so that the material is not suitable for being used as a sewage treatment filler for sewage dephosphorization.
Claims (7)
1. The application of the sewage dephosphorization material in sewage dephosphorization is characterized in that: the preparation method of the sewage dephosphorization material comprises the following steps:
A. uniformly mixing titanium gypsum, fly ash, municipal sludge and borax to obtain a mixture;
B. balling the mixture, and then naturally air-drying to obtain raw material balls;
C. sintering the raw material balls at high temperature, and then cooling to room temperature along with a furnace to obtain the sewage dephosphorization material;
the weight ratio of the titanium gypsum, the fly ash and the municipal sludge to the borax is 20-40: 30-50: 20-40: 5-10;
the water content of the titanium gypsum is 15-30wt%, and the iron content is Fe 2 O 3 13-18wt% of TiO 2 The content is 2-5wt%;
the municipal sludge is biochemical sludge of a municipal sewage plant, and the water content of the municipal sludge is 75-85wt%.
2. The use according to claim 1, characterized in that: and the natural air drying time is 1-2 d.
3. The use according to claim 1, characterized in that: the particle size of the green pellets of the material is 4-7 mm.
4. The use according to claim 1, characterized in that: the particle size of the sewage dephosphorization material is 3-5 mm.
5. The use according to claim 1, characterized in that: and in the sintering process, the temperature rising rate of 2-5 ℃/min is increased to 800-900 ℃ for sintering for 1-2 h.
6. The use according to claim 1, characterized in that: the hydrochloric acid solubility of the sewage dephosphorization material is 0.63-1.79%.
7. The use according to claim 1, characterized in that: the adsorption removal rate of the sewage dephosphorization material to phosphorus is 91.27-98.39%.
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